Eccentric fuel nozzle



- .July 20, 1937. E. OLSON ECCENTRIC FUEL NOZZLE Filed May 28, 1936 I HH'4 INVENTOR. EL ME/P One/v.

ATTORNEY.

Patented July 20, 1937 UNITED STATES ECCENTRIC FUEL NOZZLE Elmer Oison,Ferdale, Mich., assignor to Milton E. Chandler, Detroit, Mich.

Application May 28, 1936, Serial No. 82,228

3 Claims.

The object of this invention is to correct distribution errors in aninternal combustion engine inlet manifold by placing the fuel nozzleeccentric with reference to the venturi. p

I have discovered that the well-known lack of uniform distribution in aninlet manifold may be corrected by an eccentric discharge of fuel intothe air stream provided the required correction is not very large.

Aiternatively I have discovered that if the fuel is discharged into thecenter of the air stream, but if the flange surrounding the fuel nozzleopening is eccentric, the air flow is distorted and a similar result isobtained.

Figure 1 shows a cross-sectional elevation taken on plane l--l of Figure2.

Figura 2 is a cross-sectional plan View taken on plane 2-2 of Figure 1.

Figure 3 corresponds to Figure 1 and also shows the efiect of the airstream of the eccentric fuel nozzle.

Figura 4 shows a cross-sectional elevation taken on plane 4-4 ofFigure`5 and shows an alternative Construction.

Figure 5 shows a cross-sectonal 'plan View taken on plane 5-5'of Figure4.

f lligure 6 shows the carburetor on the mani- In the figures, ll) is theair entrance, II is' the choke valve, l2 is the float chamber, |3 is thefloat, M is the float valve, I5 is the eccentric nozzle which issupplied with fuel from afuel passage IG, which communicates with aninclined and relatively large fuel passage l'l through a restriction IB,with the float chamber |2. !9 refers to air vents which aspirate thefuel issuing from IB before it discharges out of the eccentric nozzle I5.

is the low speed fuel passage which con- 40 veys fuel from I6`and aii'from |9 to the low speed fuel by-pass 2l, which discharges fuel throughthe outlet 23 into a mixture outlet 40 on the engine side of a throttle24 mounted on a throttle rod 25.

45 The addition of a fuel outlet 22 permits the transition from the lowspeed fuel by-pass 2l to the operation of the main fuel nozzle |5 to bemade smoothly. These various passages are no part of the presentinvention.

50 The eccentric nozzle |5 is located eccentrically with reference tothe venturi 26. That is to say, the uel outlet passage 39 is concentricwith reference to the venturi 26. The outside wall or fiange of theeccentric nozzle l5 throwsthe 55 stream of atomized fuel and aireccentric of the air stream, as shown in Figures 2, 3, and 5. Byarranging so that the direction of the eccentricity with reference tothe axis of the throttle 25 can be varied, I have discovered that it ispossible to correct to a great extent the lack of uniform distributionin the manifolds of multicylinder internal combustion engines. The greatadvantage of this method is that I can fit a carburetor to an enginewith much less time than is necessary when no means are avail- 10 ablefor varying the distribution and for con-. celiing out thenon-uniformity of distribution in the inlet manifold which is inherentin the design of practically all intake manifolds.

If an attempt is made to correct the lack of 15 uniformity by makingchanges in the inlet manifold thousands of dollars are spent in patternsand. in machining castings before a desirable or less objectionabledistribution manifold is perfected. For a comparatively few cents an ec-0 centric nozzle such as l5 can be made and changed to suit, and thedirection of eccentricity varied and the degree of eccentricity varieduntil* such time as the lack of uniformty of distribution produced bythe eccentric nozzle !5 cancels 25 out the lack of uniformity anddistribution inherent in the inlet manifold design.

In Figure 4 the nozzle itself appears to be concentric with reference tothe Venturi tube,- 26, but actually in the plan view shown in Figure 5the fuel nozzle 39, having a' concentric fiange 5, is shown locatedeccentrically with reference to the throat of the venturi 26. Byshifting the nozzle ofi center the distribution may be corrected to anydesired degree.

In Figure 6, 4l is the inlet to the manifold 42 to which the carburetoris bolted. 43 and 44 are twoof the mixture outlets leading from themanifold.

What I have discovered is that if I make a nozzle which is eccentric tothe air stream the fuel will follow the eccentricity of the nozzle andpermit me to place the fuel in any location in the mixing chamber inrelation to the outlet past the throttle. The principal advantage is 45Secured. When the throttle is wide open.

What I claim is:

1. A carburetor having an air entrance, a mixture chamber of Venturiform, a fue] nozzle discharging therein along an axis parallel to that.of the venturi, a mixture outlet separated from said mixture chamberand having a throttle valve therein Whereby the flow around the nozzleis independent of the position of the throttle valve, means located inthe throat of 2 i 2,o87,293 V 2. A carburetor as set forth in claim 1 inwhich there is a fiange which forms the .lip of the fuel nozzle, saidfiange being unsymmetrically located in the throat of said venturi.

3. A carburetor as set forth in claim 1 in which there is a fiange whichforms the lip of said fuel nozzle, said flange being arrangedconcentrcally around the nozzle but eccentrically located within thethroat of the venturi.

` ELMER OLSON.

A A E). mm

